A Group Unit Specific To An Animal Is Called A The Medical Significance of the Arachnida Class of the Arthropods

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The Medical Significance of the Arachnida Class of the Arthropods

The class Arachnida is a group of more than 100,000 species, including spiders, scorpions, ticks and mites. Most arachnids are adapted to kill prey with poisonous needles, stings or fangs. Like crustaceans, arachnids have a body that is divided into a cephalothorax and an abdomen.

With the Cephalothorax are 4 pairs of legs, a pair of Chelicerae and a pair of appendages called pedipalps. Pedipalps assist in chewing; in some species the pedipalps are specialized to perform other functions. Arachnids undergo incomplete metamorphosis. The class Arachnida includes 3 orders of medical importance:

1. Order Scorpios

2. Order Araneae (spiders)

3. Order Acari (bugs and mites)

Scorpions

Scorpions are a well-known group of arachnids whose pedipalps are modified into pincers. Scorpions use these pincers to handle their food and tear it apart. The poisonous bites of scorpions are mainly used to stun their prey and less often for self-defense. The blow is located on the terminal segment of the body, which is thin to the end. The elongated and jointed abdomen of scorpions is distinctive; in most chelicerates, the abdominal segments are more or less fused together and appear as a single unit. Adults of this order of arachnids range in size from 1 to 18 centimeters. There are about 1,200 species of scorpions, all terrestrial, found throughout the world, although they are common in tropical, subtropical, and desert regions. Scorpion society is elaborate, with spermatophores being fixed to a substrate by the male and then retrieved by the female. Young are born alive, with 1 to 95 in a given litter. Scorpions differ from spiders in two ways. Scorpions have greatly expanded pedipalps, which they hold in a forward position. They also have a large sting on the last abdominal segment. Most scorpions hide during the day and hunt at night. Scorpions grasp their prey with their pincer-like pedipalps. Then the fang injects paralyzing poison, the chelicerae tear the prey, the animal is swallowed and digestion begins. Only a few species have a bite that can be fatal to humans. They do not bite a human unless attacked.

Pathogenicity

Local bite symptoms include severe pain, inflammation and swelling. Sweating, nausea and vomiting are common systemic symptoms. Muscle spasms and convulsions may occur in severe cases. The fatal outcome is caused by respiratory failure, pulmonary edema and shock.

control

Spraying insecticides

Spiders

There are about 25,000 named species of spiders (order Araneae). These animals play a major role in all terrestrial ecosystems, where they are particularly important as predators of insects and other small animals. Spiders hunt their prey or catch it in a web. The silk of the webs is formed from a liquid protein that is forced out of the spindles, modified appendages at the back of the spider’s abdomen. Spiders have venom glands running through their chelicerae, which are sharp and used to bite and paralyze prey. Some members of this order, such as the black widow spider (Latrodectus mactans), the Australian black widow spider (Latrodectus seville), the karakurt (latrodectus tredicimguttatus), the brown recluse (Loxosceles reclusa), the tarantula (Lycosa singoriensis), have bites that are poisonous. in humans and other large mammals.

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